Generally accepted short form of locum teneus, or short term substitute for an IFA in the event of absence from work for any reason e.g. holiday, sickness. The locum must be able to provide the same level of advice as the principal.

someone (physician or clergyman) who substitutes temporarily for another member of the same profession

A temporary health or social care professional.This person does not have a permanent contract with the Trust.

Slang for crazy, also spelled "loco."